Features: Unique panel, better meet the visual aesthetic needs of different home decoration matching.Large-diameter air outlet, equipped with anti-backflow gravity wind deflector to take over, smooth air out and improve ventilation efficiency.Independent volute, wind wheel matching design, effective sound insulation and reduce wind noise.Two-way flat large wind wheel with equally spaced blades improves wind speed.Metal box, low resonance coefficient, safe, quiet and durable.Hole size: 211*211CMLow noise: 34dbApplication: living room and bedroom, kitchen bathroom, office restaurant, public shopping mall.Function: In addition to peculiar smell/smoke smell, moisture-proof, mute, high-efficiency and energy-saving ventilation